As Microsoft celebrates the five-year anniversary of the Surface Pro, data from IDC reveals that unit sales of Microsoft Surface detachable laptops and tablets have dropped nearly 19 percent in the last year.

While Microsoft's Windows Defender frowned upon "optimizer" or "cleaner" apps that didn't explain what they did, it's drawing the line on "scareware" apps that tell you that your PC will be ruined if you don't pay up.